Telephone-transmitter



E. 0. WILCOX & B. L. LAWTON.

(No Model) 4 TELEPHONE IRANSMITTER. No; 585,896. Patented July 6, 189 7.

UNTTED STATES PATENT QEETCE.

ERNEST C. \VILCOX AND BURTON L. LAl/VTON, OF MERIDEN, CONNECTICUT.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 585,896, dated July 6, 1897.

Application filed August 31, 1396. Serial No. 604,399. (No model.)

To all whom it may concern:

Be it known that we, ERNEST C. WILOOX and BURTON L. LAWTON, of Meriden, in the county of New Haven and State of Connecticut, have invented a new Improvement in Telephone-Transmitters; and we do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in-

Figure 1, a perspective view of atelephonetransmitter constructed in accordance with our invention; Fig. 2, a broken View, in central section, through the telephone-transmitter proper; Fig. 3, a view in front elevation of the telephone-transmitter with the cap, carbon disk, and retaining-washer removed Fig. 4, a sectional view through the inner end of the carrier-arm, showing the friction-springs by means of which it is held in position; Fig.

5, a broken view, in side elevation, of the chambered head and the inner end of the carrier-arm, with one of the lugs of the former broken away; Fig. 6, a detached perspective view of the annular retaining-washer.

Our invention relates to an improvement in carbon telephone-transmitters, the object being to produce a simple and compact device, composed of comparatively few parts, constructed with particular reference to securing the highest efficiency and the greatest convenience.

WVith these ends in view our invention consists in a telephone-transmitter having certain details of construction and combinations of parts, as will be hereinafter described, and pointed out in the claims.

In carrying out our invention, as herein shown, we fill or partially fill the space be tween the carbon conducting-diaphragm A and the carbon disk B with granular carbon C, the grains of which are preferably ovoidal in form, as distinguished from grains of angular or truly spherical form, but we do not limit ourselves to employing any particular kind of carbon. The said carbon conductingdiaphragm Ais held in place by means of an annular spring-washer D, bowed flatwise to produce a plurality of contact-points, which engage with the edges of the diaphragm, so as to hold the same in place. On account, however, of the peculiar form of the washer it does not bind or confine the edges of the diaphragm so closely as to interfere with the free vibration thereof. The said diaphragm and washer are interposed between the body E and cap F of the transmitter, the body E being mounted in any approved manner upon the vertically-swiveled carrier-arm G. In Fig. 2 of the drawings the bent washer D is shown as interposed between the cap F and the diaphragm A, which is seated upon the body E, the said washer being in contact with the diaphragm at points (1 cl and in contact with the cap at the point d.

If desired, we may employ two annular washers like the washer D, in which case the diaphragm A will be interposed between them. If desired also, we may place the washer against the body E, in which case the diaphragm'will be interposed between it and the cap F.

The cap F is furnished in the usual manner with a centrally-arranged, outwardlyprojecting, externally-threaded collar F, to which the mouthpiece F is attached. The carbon disk 15 has its outer face concentrically corrugated and is inclosed in an envelop B of fabric. It is secured to the body E of the transmitter by means of a screw H and has proper electric connections, which we need not describe.

The inner end of the arm G is formed with a circular head G, the opposite faces of which are provided with corresponding circular recesses G2 G having centrally arranged square hubs G G the said recesses receiving dished disk-shaped friction -springs H H, having square central openings to adapt them to fit over the hubs G G which hold them against rotation. The said springs are radially slotted to divide them into spring-fingers, the outer ends of which frictionally engage with the inner walls I I of the lugs I I, which receive the inner end of the arm G between them, the said lugs being formed integral with the chambered head J of the device, as shown. These springs not only hold the arm Gin any position of vertical adjustment in which it may be placed, but also greatly improve the electric connection between the arm and the chambered head J of the device, as both springs are in direct and positive contact with both the arm and the chambered head. We may employ one spring instead of two, if preferred, and do not limit ourselves to constructing or arranging the spring or springs as shown.

In view of the changes suggested and shown and of others which may obviously be made we would have it understood that we hold ourselves at liberty to make such changes and alterations as fairly fall within the spirit and scope of our invention.

Having fully described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. In a telephone-transmitter, the combination with a chambered head formed with j two forwardly-projecting lugs, of a carrier f arm having its inner end inserted between the I said lugs, a pivot passing through the lugs slits into spring leaves or fingers, the outer and arm for pivotally connecting the latter with the former, and one or more frictionsprings interposed between the arm and lugs for holding the arm in any desired position of adjustment, and for improving the electrical connection between the arm and head, the inner end of the said arm, and the said lugs being constructed and adapted for the interposition of one or more friction-springs between them, and the said springs having constant positive contact with both the arm and the lugs, independently of the pivot.

2. In a telephone-transmitter, the combination with a chambered head formed with two forwardly-projecting lugs, of a carrierarm having its inner end inserted between the said lugs and constructed with a recess in I which a hub is located, a *pivot extending through the lugs and arm for pivotally connecting the latter with the head, and a friction-spring located in the said recess so as to engage with the said hub, by which it is held said lugs.

4. In a telephone-transmitter, the combination with a chambered head formed with forwardly-projecting lugs, of a carrier-arm pivotally mounted between the said lugs, and

having its inner end constructed with two recesses in each of which a square hub is located, dished, disk-shaped friction-springs, having square central openings to adapt them to fit over the hubs, and divided by radial slots or ends of which engage with the inner walls of the said lugs.

5. In a telephone-transmitter, the combination with the body and cap thereof, of a carbon conducting-diaphragm interposed between the said body and cap, and an annular elastic conducting-washer bowed flatwise to produce a plurality of contact-points, and arranged between the bodyand cap so as to make a plurality of engagements with the diaphragm, whereby the same is firmly held in place, but not so closely as to interfere with its vibration.

In testimony whereof we have signed'this specification in the presence of two subscribing witnesses.

' ERNEST O. WVILCOX.

BURTON L. LAWTON. WVitnesses:

J. S. NORTON, Jr., LoUIs FISK. 

